(一).特重交通( 不包括高速公路)——城市快速路、货运主干路 Ne=45*10(次/车道) E0 =30MPa fr =5.0MPa EC = 31GPa 基层 h1 =20cm 二灰碎石 E1=1400MPa (6:14:80) 底基层 h2 =20cm 二灰砂砾 E2=1200MPa (7:13:80) Ex=E1h1+E2h2/ h1+h2 =(1400*0.2+1200*0.2)/(0.2+0.2)=1300 a=6.22〔1-1.51(1300/30) b=1-1.44(1300/30)
3
3
-0.55
-0.45
2
2
2
2
2
2
2
2
6
〕=4.497
=0.819
-1
Dx=(E1h1+E2h2)/12+(h1+h2)/4*(1/h1E1+1/h2E2)
=(1400*0.2+1200*0.2)/12+0.4/4*(1/0.2*1400+1/0.2*1200) =6.903 hx=(12Dx/Ex)
b
1/33
3
2
-1
2
=(12*6.903/1300)
1/3
1/3
=0.3994
*30(1300/30)
1/3
Et=ahx* E0(Ex/E0)=4.497*0.3994
0.819
=223.520
砼板相对刚度半径 r=0.537h(Ec/Et)
设板厚 h=25cm
r=0.537*0.25(31000/223.520) σPS =0.077r
0.6
-2
1/3
1/3
=0.695
*0.25=0.9903
-2
*h=0.077*0.695
0.057
0.6
kr=0.87 kf=Ne=2.730 kc=1.25
60.057
σPr =kr*kf*kc*σPS=0.87(45*10)
*1.25*0.9903=2.941
设板长 L=5m L/r=7.2 查图B.2.2 Bx=0.63
北京地区最大温度梯度按《城市道路设计规范》表10.2.8 Tg=80℃/m
σtm =(10
-5
*EC*h* Tg*Bx)/2=(10*31000*0.25*80*0.63)/2=1.953
c
-5
按《公路水泥混凝土路面设计规范》表B.2.3 回归系数 a=0.828 b=0.041 c=1.323 kt= fr/σtm〔a(σtm / fr)-b〕=5/1.953〔0.828(1.953 /5) =0.5062
σtr=kt*σtm =0.5062*1.953=0.989
可靠度系数根据《公路水泥混凝土路面设计规范》表3.0.3采用1.23
1.23(0.989+2.941)=4.834 MPa<fr =5.0 MPa 可
1.323
-0.041〕
(二).特重交通——高速公路
Ne=45*10(次/车道) E0 =30MPa fr =5.0MPa EC = 31GPa 基层 h1 =20cm 二灰碎石 E1=1400MPa (6:14:80) 底基层 h2 =20cm 二灰砂砾 E2=1200MPa (7:13:80) Ex=E1h1+E2h2/ h1+h2 =(1400*0.2+1200*0.2)/(0.2+0.2)=1300 a=6.22〔1-1.51(1300/30) b=1-1.44(1300/30)
3
3
-0.55
-0.45
2
2
2
2
2
2
2
2
6
〕=4.497
=0.819
-1
Dx=(E1h1+E2h2)/12+(h1+h2)/4*(1/h1E1+1/h2E2)
=(1400*0.2+1200*0.2)/12+0.4/4*(1/0.2*1400+1/0.2*1200) =6.903 hx=(12Dx/Ex)
b
1/33
3
2
-1
2
=(12*6.903/1300)
1/3
1/3
=0.3994
*30(1300/30)
1/3
Et=ahx* E0(Ex/E0)=4.497*0.3994
0.819
=223.520
砼板相对刚度半径 r=0.537h(Ec/Et)
设板厚 h=27cm
r=0.537*0.27(31000/223.520) σPS =0.077r
0.6
-2
1/3
1/3
=0.7505
0.6
*h=0.077*0.7505
0.057
*0.27=0.8892
-2
kr=0.87 kf=Ne=2.730 kc=1.30
60.057
σPr =kr*kf*kc*σPS=0.87(45*10)
*1.30*0.8892=2.746
设板长 L=5m L/r=6.662 查图B.2.2 Bx=0.57
北京地区最大温度梯度按《城市道路设计规范》表10.2.8 Tg=76℃/m
σtm =(10
-5
*EC*h* Tg*Bx)/2=(10*31000*0.27*76*0.57)/2=1.813
c
-5
按《公路水泥混凝土路面设计规范》表B.2.3 回归系数 a=0.828 b=0.041 c=1.323 kt= fr/σtm〔a(σtm / fr)-b〕=5/1.813〔0.828(1.813 /5) =0.4836
σtr=kt*σtm =0.4836*1.813=0.877
可靠度系数根据《公路水泥混凝土路面设计规范》表3.0.3采用1.33
1.33(0.877+2.746)=4.819 MPa<fr =5.0 MPa 可
1.323
-0.041〕
(三).特重交通( 不包括高速公路)——城市快速路、货运主干路 Ne=35*10(次/车道) E0 =30MPa fr =5.0MPa EC = 31GPa 基层 h1 =20cm 二灰碎石 E1=1400MPa (6:14:80) 底基层 h2 =20cm 二灰砂砾 E2=1200MPa (7:13:80) Ex=E1h1+E2h2/ h1+h2 =(1400*0.2+1200*0.2)/(0.2+0.2)=1300 a=6.22〔1-1.51(1300/30) b=1-1.44(1300/30)
3
3
-0.55
-0.45
2
2
2
2
2
2
2
2
6
〕=4.497
=0.819
-1
Dx=(E1h1+E2h2)/12+(h1+h2)/4*(1/h1E1+1/h2E2)
=(1400*0.2+1200*0.2)/12+0.4/4*(1/0.2*1400+1/0.2*1200) =6.903 hx=(12Dx/Ex)
b
1/33
3
2
-1
2
=(12*6.903/1300)
1/3
1/3
=0.3994
*30(1300/30)
1/3
Et=ahx* E0(Ex/E0)=4.497*0.3994
0.819
=223.520
砼板相对刚度半径 r=0.537h(Ec/Et)
设板厚 h=24cm
r=0.537*0.24(31000/223.520) σPS =0.077r
0.6
-2
1/3
1/3
=0.667
*0.24=1.0485
-2
*h=0.077*0.667
0.057
0.6
kr=0.87 kf=Ne=2.692 kc=1.25
60.057
σPr =kr*kf*kc*σPS=0.87(35*10)
*1.25*1.0485=3.069
设板长 L=5m L/r=7.495 查图B.2.2 Bx=0.64
北京地区最大温度梯度按《城市道路设计规范》表10.2.8 Tg=82℃/m
σtm =(10
-5
*EC*h* Tg*Bx)/2=(10*31000*0.24*82*0.64)/2=1.952
c
-5
按《公路水泥混凝土路面设计规范》表B.2.3 回归系数 a=0.828 b=0.041 c=1.323 kt= fr/σtm〔a(σtm / fr)-b〕=5/1.952〔0.828(1.952 /5) =0.506
σtr=kt*σtm =0.506*1.952=0.988
可靠度系数根据《公路水泥混凝土路面设计规范》表3.0.3采用1.23
1.23(0.988+3.069)=4.990 MPa<fr =5.0 MPa 可
1.323
-0.041〕